Quick update: we’ve resolved the original Codex phone-verification issue discussed in this thread!
If you’re still blocked, please continue working with Support in your existing case. Some remaining reports may have a different cause, so the support team will review them case by case. If you don’t have a case yet, please contact Support and include the exact time and time zone of one fresh sign-in attempt, plus the screen or error you see.
Thanks again to everyone who shared details here!